Lever mechanism.



J. F. S. GOBLE.

LEVER MEGHANISM.

APPLICATION FILED M3521, 190s.

91 3,490. Patent-,enen 23, 1909..

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UNITED STATES PATENT OFFICE.

JAMES F. S. GOBLE, OF NEW ALBIN, IOWA, ASSIGNOR OF ONE-HALF lO HOWARD C. BOYER, OF NEW ALBIN, IOWA.

LEVER MECHANISM.

To all whom 'it may concern:

Be it known that I, JAMES F. S. GoBLE, a citizen of the United States, residing at New Albin, in the county of Allamakee and State of Iowa, have invented new and useful Improvements in Lever Mechanism, of which the following is a specification.

This invention relates to an eccentric lever mechanismy for opening and closing gates or doors or o erating other parts of any kind or type for W ich it is adapted.

The object of the invention is to provide a lever mechanism of this character which is simple of construction, inexpensive of production, and by means of which a considerable amount of power may be applied with a minimum amount of operating force.

The invention consists of the features of construction, combination and arrangement of parts hereinafter fully described and claimed, reference being had to'the accompanying drawing, in which:-

Figure 1 is a perspective view of a lever mechanism embodying my invention showing the lever in normal and thrown positions in full and dotted lines. Fig. 2 is a side elevation of the same.

Referringto the drawing, the numeral 1 designates a supporting member, which may consist of a ost or jamb at one side of the gateway or oorway, which member is provided with a vertical transverse slot 2, to receive the adjacent end of the gate or door, which is supported to travel from open to closed positlons and vice versa upon a stationary horizontal or tilting track. The gate or door and its mountings are not herein shown, as they constitute no part of the present invention and as the latter may not only be employed for rocking a tilting track but may be used for operating the rack mechanism of a sliding gate or operating other tilting parts for opening and closing gates or doors or for other analogous purposes. In fact, the lever mechanism may be used to actuate various kinds of operating and controlling devices, and therefore is not limited to any specific use. One of the faces of the post or supporting member 1 is formed with Specification of Letters Patent.

Application filed. March 21, 1908.

Patented Feb. 23, 1909.

serial No. 422,557.

a vertical slot 3 which communicates with the aforesaid transverse slot 2.

Arranged upon the face of the post in which the slot 3 is formed is a fulcrum frame comprising upper and lower' longitudinal bars 4 and 5 secured at their inner ends in any suitable manner to the post above and below the slot 3. intermediate of their length by vertical bracing strips 6, which may also serve as guides or stays for the lever to assist in preventing lateral movement thereof, as hereinafter described. Preferably, the bars are longitudinally curved or suitably inclined from the post toward each other, so that they converge outwardly throughout their length, the inner portion 4a and 5a of said bars being arranged in a prescribed divergent relation and at an angle to the post to form stops or abutments limiting the upward and downward movements of the power arm of the lever. The outer ends of the bars 4 and 5, which are spaced a considerably less distance apart than their inner ends forming the stop portions la and 5a, are connected by a pair of vertical parallel strips 7, forming the guide rails of a slotted or divided track, said rails being curved on the arc of a circle of a suitable thrust radius.

A lever 8 extends longitudinally through the fulcrum frame between the bars 4 and 5, bracing stri s 6 and rails 7, by which it is guided and imited in its movements. The forward portion of the lever forms a power arm 9, having its forward or free end projecting through the slot 3 into the slot 2 of the post 1 and adapted for connection with the track or other part to be tilted. This arm 9 rocks on the bar 5, which forms a shifting fulcrum for the lever. The outer or rear end of the lever proj ects beyond the curved track and forms an operating arm 10, which may be provided at its outer end with a suitable handle or grip 11, whereby the lever may be operated. At the point of junction of the two arms 9 and 1() the lever is provided on its opposite sides with pairs of suitable guide devices, such as pins or rollers 12, to engage and slide and run upon the innel` The bars are connected` and outer edges of the track rails 7, the rails and guides forming a shifting means on which the lever swings and simultaneously rides in the arc of avcircle in its movements, whereby the lever is shifted endwise as it swings on the fulcrum bar 5.l toy cause the forward end of the power arm 10 to move in a straight or rectilinear path.

The normal position of the lever is shownY in Figs. l and 2 in full lines, the weight of the lever arm. 9 or the part to which it is attached being sufficient to hold said arm down in its lowered position against the stop portion 5@1 of the fulcrum bar 5, while the arm 1'()` is at the limit of its upward'movement inthey slotted track 7 and ears against the outer end ofv the arm 4. l/Vhen the arm 10 is drawn downward by means ofthe grip ll to swing the lever for the purpose of tilting the part to-which it is applied, the arm 9 rocks upon the fulcrum bar 5 and successively shifts its position alongl the surface of the latter as the free end thereof swings upwardly inthe slot 3. The arm at the limit ofy its downward movement occupies the lower end of the slotted track and rests against the outer end of the bar 5, while the power arm ofrv the lever is at the upper end of the slot 3' and bears against the stop 4a, as illustrated in both figures-in dotted lines. As the armi?) rocks on the fulcrum bar 5 and constantlyl shifts its position thereon the rollers 12 travel along the guide rails 7 and act to draw the lever back or to shift it endwise in a rearward direction to give a straight line motion to the freeend of the arm 9, or, in other words, to cause the forward end of the lever to move in a true-rectilinear path. thus be seen that in its up and down swinging movement, the lever not only swings in a determined arc on its shifting fulcrum but is shifted endwise by the guides 7 and 12, thus varying its center to impart an eccentric throw to the arm 9, and to cause the free end of said arm to move in a straight or rectilinear path, thus enabling a high degree of power to be obtained through the expenditure of a minimum degree of force and avoiding the objections to levers of thatvclass pivotally mounted upon fixed pins, bolts or fulcrums. Then the grip 11- isreleased, the

weight of the tilting part maybe utilized to return the lever to normal position, or any other means for that purpose may be employed. rl`he combined swingingV and shifting movement of the lever in an arcuate path also adapts the lever to have ready and free movement and prevents binding thereofv at any point in its path of travel.

Having thus fully described the invention, what is claimed as new is 1. A power mechanism comprising a curvedfulcrum, a lever free from connection with said fulcrum Vand adapted to rock It will' loosely thereon for a constant shifting of its position on said fulcrum, and guiding means for shifting the lever endwise as it rocks to cause the free end thereof to move in a straight path.

2. A power mechanism comprising a support provided with a curved fulcrum, a lever extending through said support and adapted to rock upon said fulcrum and to shift its position along the length thereof, and guiding means for shifting the lever endwise asit rocks on said fulcrum to cause the free end of the lever to move in a straight path.

3. A power mechanism comprisinga iioating lever, a curved shifting` fulcrum` for the lever, and means for shiftingA the lever endvflise as it rocksupon said fulcrum to adapt t estraight path.

4. A power mechanism comprising a bracket having a longitudinally curved fulcr-um'portionI and an arcuate guide disposed generally at right angles thereto, and a lever extending loosely throughl said bracket and adapted to have a shifting rocking motion on said fulcrum portion, said lever being providedy with guiding means engaging and traveling on said arcuate guide to shift it endwise in its rocking movementsl to cause the operating end of the lever tomove inl aL straight path.

5. A power mechanism comprising asupport, a bracket carriedv by the support and provided with a longitudinally curved fulcrum-bar andv an arcuate'guide extending at an angle to said fulcrum bar, and a lever extending through said bracket and free to swing loosely for a shifting rocking movement on the fulcrum bar, said lever being' provided with means slidably and pivotally engaging said arcuate guide whereby thel vided with a curved guide portion, and al lever extending loosely through said bracketV and having its forwardend arranged to move in said slot', said lever being adapted fora shifting rocking movement on the fulcrum and provided with guiding means engaging said curved guide portion to longitudinally shift said lever in its swingingmovements.

8. A power mechanism comprising a slotpower end ofl the lever to move in az ted support, a bracket carried by the supmeans carried by the lever and slidably and port, said bracket having a longitudinally pivotally enga ing said curved guides to curved fulcrum bar and curved guides dislongitudinally sift said lever in its swinging posed at right angles to said bar and movements.

5 at the end thereof o posite said support, In testimony whereofI alIiX my signature 15 a lever extending oosely through the in presence of tWo Witnesses. bracket having its 'forward end arranged to JAS. F. S. GOBLE. move in the slot in the sup ort, said lever Witnesses: being adapted to have a s ifting rocking H. MARTIN,

10 motion on the ulcrum bar, and a guiding MICHAEL MOORE. 

